Pismo Beach, CA -- Three shark sightings over the past five days in Pismo Beach have kept surfers and beach goers on the edge. Warning signs have been posted. The first sighting was reported on Saturday. Then the Pismo Beach Police Department says there was another one around 2:30 Tuesday afternoon. That is when a surfer reported seeing a 10 to 15-foot shark just south of the pier in about eight feet of water, 90 feet offshore. And the Sandbar Surf Company reported another sighting yesterday morning in that same area around 11:30. No word yet on what type of shark it is. If you see a shark, call the Pismo Beach Police Department or Cal Fire immediately. The beach is still open.